Four years after Taylor Swift accused a radio station DJ of groping her before a concert in Denver, the pop superstar told her story in sometimes unflinching language and called the encounter despicable, horrifying and shocking.

Swift used the word "ass" dozens of times on the witness stand Thursday as she told jurors that David Mueller reached under her skirt during a meet-and-greet photo op in 2013.

Mueller sued Swift after her team reported the alleged assault to his bosses at a country music station. He's seeking up to $3 million, saying the allegation cost him his job and reputation.

Swift countersued, claiming sexual assault.

Her defiant, hour-long testimony came four days into a rapidly moving trial that is scheduled to last nearly two weeks.